🚨 Cherry-pick Conflicts: [Chaos][OADP] Automate Polarion TC CNV-12020: Drain the node where the VM is located during OADP Backup (PR #1820)

[github-actions]

⚠️ Cherry-pick Conflicts - Manual Resolution Required

The automatic cherry-pick of PR #1820 from qwang1/openshift-virtualization-tests resulted in conflicts.

Original PR: [Chaos][OADP] Automate Polarion TC CNV-12020: Drain the node where the VM is located during OADP Backup
Author: @qwang1
Merge Commit: 1e18fc7

🔧 How to resolve:

1. Check out this branch locally: git fetch origin && git checkout cherry-pick-pr-1820-17726271826-conflicts
2. Resolve conflicts in the affected files
3. Test your changes thoroughly
4. Commit your resolution: git add . && git commit
5. Push changes: git push origin cherry-pick-pr-1820-17726271826-conflicts
6. Mark this PR as ready for review

📁 Files with conflicts:

tests/chaos/oadp/conftest.py tests/chaos/oadp/test_oadp.py 

Original PR Link: #1820
Original Commit: 1e18fc7

Original PR Description

Short description:

It needs #1678 as its dependence.

More details:

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for reviewer:

jira-ticket:

Summary by CodeRabbit

• Tests
  • Added a chaos test that drains a VM’s host node during an in-progress backup and verifies the backup completes within the expected timeout.
  • Added a supporting fixture to automate draining the host and verifying node schedulability during backup chaos scenarios.
  • Confirmed the existing reboot-during-backup chaos test behavior remains unchanged.

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[openshift-virtualization-qe-bot]

D/S test tox -e verify-bugs-are-open failed: cnv-tests-tox-executor/16702

[openshift-virtualization-qe-bot]

D/S test tox -e verify-bugs-are-open failed: cnv-tests-tox-executor/16704